bpo-46648: Skip test_urllib2.test_issue16464() (GH-31161)

POST requests to http://www.example.com/ fail randomly.
(cherry picked from commit 1578de2)

Co-authored-by: Victor Stinner <vstinner@python.org>

Author: miss-islington

Lib/test/test_urllib2.py

@@ -1790,6 +1790,8 @@ class MyOtherHTTPHandler(urllib.request.HTTPHandler):
 
     @unittest.skipUnless(support.is_resource_enabled('network'),
                          'test requires network access')
+    # bpo-46648: test fails randomly with "http://www.example.com/" URL
+    @unittest.skipIf(True, "POST request to http://www.example.com/ fail randomly")
     def test_issue16464(self):
         with socket_helper.transient_internet("http://www.example.com/"):
             opener = urllib.request.build_opener()